Mammalian thymus is mainly concerned with

Which gland undergoes atrophy in adults?

What would happen to the immune system if the thymus gland is removed from the body of a person?

Which of the following glands is associated with the occurrence of sarcoma-type cancer?

Select the correct statements regarding Thymus gland.
i. It is located in the upper part of thorax.
ii. It is made up of four lobes of lymphoid tissue.
iii. It is a prominent gland formed at birth and remains active throughout life.
iv. It is also called temporary gland.
v. It plays an important role in the development of immune system and provides humoral immunity.
In the light of above statements,choose the correct option from below.

The thymus is a lobed organ located near the $...A...$ and beneath the $...B...$. The most appropriate combination for $A$ and $B$ is: